pub fn parse_truing_observation(
s: &str,
units: UnitSystem,
) -> Result<TruingObservation, String>Expand description
Parse an --observed RANGE:DROP token. RANGE is in the caller’s distance
units (yards imperial / meters metric) and is normalized to internal yards;
DROP stays in the caller’s drop unit. Returns a user-facing error string on
malformed input so the CLI can report cleanly instead of panicking.